// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
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// contributors may be used to endorse or promote products derived from
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//
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package com.google.protobuf;
import java.io.InputStream;
import java.nio.ByteBuffer;
/**
* Abstract interface for parsing Protocol Messages.
*
* <p>The implementation should be stateless and thread-safe.
*
* <p>All methods may throw {@link InvalidProtocolBufferException}. In the event of invalid data,
* like an encoding error, the cause of the thrown exception will be {@code null}. However, if an
* I/O problem occurs, an exception is thrown with an {@link java.io.IOException} cause.
*
* @author liujisi@google.com (Pherl Liu)
*/
public interface Parser<MessageType> {
// NB(jh): Other parts of the protobuf API that parse messages distinguish between an I/O problem
// (like failure reading bytes from a socket) and invalid data (encoding error) via the type of
// thrown exception. But it would be source-incompatible to make the methods in this interface do
// so since they were originally spec'ed to only throw InvalidProtocolBufferException. So callers
// must inspect the cause of the exception to distinguish these two cases.
/**
* Parses a message of {@code MessageType} from the input.
*
* <p>Note: The caller should call {@link CodedInputStream#checkLastTagWas(int)} after calling
* this to verify that the last tag seen was the appropriate end-group tag, or zero for EOF.
*/
public MessageType parseFrom(CodedInputStream input) throws InvalidProtocolBufferException;
/**
* Like {@link #parseFrom(CodedInputStream)}, but also parses extensions. The extensions that you
* want to be able to parse must be registered in {@code extensionRegistry}. Extensions not in the
* registry will be treated as unknown fields.
*/
public MessageType parseFrom(CodedInputStream input, ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException;
/**
* Like {@link #parseFrom(CodedInputStream)}, but does not throw an exception if the message is
* missing required fields. Instead, a partial message is returned.
*/
public MessageType parsePartialFrom(CodedInputStream input) throws InvalidProtocolBufferException;
/**
* Like {@link #parseFrom(CodedInputStream input, ExtensionRegistryLite)}, but does not throw an
* exception if the message is missing required fields. Instead, a partial message is returned.
*/
public MessageType parsePartialFrom(
CodedInputStream input, ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException;
// ---------------------------------------------------------------
// Convenience methods.
/**
* Parses {@code data} as a message of {@code MessageType}. This is just a small wrapper around
* {@link #parseFrom(CodedInputStream)}.
*/
public MessageType parseFrom(ByteBuffer data) throws InvalidProtocolBufferException;
/**
* Parses {@code data} as a message of {@code MessageType}. This is just a small wrapper around
* {@link #parseFrom(CodedInputStream, ExtensionRegistryLite)}.
*/
public MessageType parseFrom(ByteBuffer data, ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException;
/**
* Parses {@code data} as a message of {@code MessageType}. This is just a small wrapper around
* {@link #parseFrom(CodedInputStream)}.
*/
public MessageType parseFrom(ByteString data) throws InvalidProtocolBufferException;
/**
* Parses {@code data} as a message of {@code MessageType}. This is just a small wrapper around
* {@link #parseFrom(CodedInputStream, ExtensionRegistryLite)}.
*/
public MessageType parseFrom(ByteString data, ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException;
/**
* Like {@link #parseFrom(ByteString)}, but does not throw an exception if the message is missing
* required fields. Instead, a partial message is returned.
*/
public MessageType parsePartialFrom(ByteString data) throws InvalidProtocolBufferException;
/**
* Like {@link #parseFrom(ByteString, ExtensionRegistryLite)}, but does not throw an exception if
* the message is missing required fields. Instead, a partial message is returned.
*/
public MessageType parsePartialFrom(ByteString data, ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException;
/**
* Parses {@code data} as a message of {@code MessageType}. This is just a small wrapper around
* {@link #parseFrom(CodedInputStream)}.
*/
public MessageType parseFrom(byte[] data, int off, int len) throws InvalidProtocolBufferException;
/**
* Parses {@code data} as a message of {@code MessageType}. This is just a small wrapper around
* {@link #parseFrom(CodedInputStream, ExtensionRegistryLite)}.
*/
public MessageType parseFrom(
byte[] data, int off, int len, ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException;
/**
* Parses {@code data} as a message of {@code MessageType}. This is just a small wrapper around
* {@link #parseFrom(CodedInputStream)}.
*/
public MessageType parseFrom(byte[] data) throws InvalidProtocolBufferException;
/**
* Parses {@code data} as a message of {@code MessageType}. This is just a small wrapper around
* {@link #parseFrom(CodedInputStream, ExtensionRegistryLite)}.
*/
public MessageType parseFrom(byte[] data, ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException;
/**
* Like {@link #parseFrom(byte[], int, int)}, but does not throw an exception if the message is
* missing required fields. Instead, a partial message is returned.
*/
public MessageType parsePartialFrom(byte[] data, int off, int len)
throws InvalidProtocolBufferException;
/**
* Like {@link #parseFrom(ByteString, ExtensionRegistryLite)}, but does not throw an exception if
* the message is missing required fields. Instead, a partial message is returned.
*/
public MessageType parsePartialFrom(
byte[] data, int off, int len, ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException;
/**
* Like {@link #parseFrom(byte[])}, but does not throw an exception if the message is missing
* required fields. Instead, a partial message is returned.
*/
public MessageType parsePartialFrom(byte[] data) throws InvalidProtocolBufferException;
/**
* Like {@link #parseFrom(byte[], ExtensionRegistryLite)}, but does not throw an exception if the
* message is missing required fields. Instead, a partial message is returned.
*/
public MessageType parsePartialFrom(byte[] data, ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException;
/**
* Parse a message of {@code MessageType} from {@code input}. This is just a small wrapper around
* {@link #parseFrom(CodedInputStream)}. Note that this method always reads the <i>entire</i>
* input (unless it throws an exception). If you want it to stop earlier, you will need to wrap
* your input in some wrapper stream that limits reading. Or, use {@link
* MessageLite#writeDelimitedTo(java.io.OutputStream)} to write your message and {@link
* #parseDelimitedFrom(InputStream)} to read it.
*
* <p>Despite usually reading the entire input, this does not close the stream.
*/
public MessageType parseFrom(InputStream input) throws InvalidProtocolBufferException;
/**
* Parses a message of {@code MessageType} from {@code input}. This is just a small wrapper around
* {@link #parseFrom(CodedInputStream, ExtensionRegistryLite)}.
*/
public MessageType parseFrom(InputStream input, ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException;
/**
* Like {@link #parseFrom(InputStream)}, but does not throw an exception if the message is missing
* required fields. Instead, a partial message is returned.
*/
public MessageType parsePartialFrom(InputStream input) throws InvalidProtocolBufferException;
/**
* Like {@link #parseFrom(InputStream, ExtensionRegistryLite)}, but does not throw an exception if
* the message is missing required fields. Instead, a partial message is returned.
*/
public MessageType parsePartialFrom(InputStream input, ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException;
/**
* Like {@link #parseFrom(InputStream)}, but does not read until EOF. Instead, the size of message
* (encoded as a varint) is read first, then the message data. Use {@link
* MessageLite#writeDelimitedTo(java.io.OutputStream)} to write messages in this format.
*
* @return Parsed message if successful, or null if the stream is at EOF when the method starts.
* Any other error (including reaching EOF during parsing) will cause an exception to be
* thrown.
*/
public MessageType parseDelimitedFrom(InputStream input) throws InvalidProtocolBufferException;
/** Like {@link #parseDelimitedFrom(InputStream)} but supporting extensions. */
public MessageType parseDelimitedFrom(InputStream input, ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException;
/**
* Like {@link #parseDelimitedFrom(InputStream)}, but does not throw an exception if the message
* is missing required fields. Instead, a partial message is returned.
*/
public MessageType parsePartialDelimitedFrom(InputStream input)
throws InvalidProtocolBufferException;
/**
* Like {@link #parseDelimitedFrom(InputStream, ExtensionRegistryLite)}, but does not throw an
* exception if the message is missing required fields. Instead, a partial message is returned.
*/
public MessageType parsePartialDelimitedFrom(
InputStream input, ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException;
}